Aza-koi

Because of her overly expressive emotions, everyone thinks that Mazumi is a flirt. After being saved on the bus one day, she develops a crush on Minato-senpai but hasn't found the courage to take the first step and approach him. While being troubled by her lack of courage, a cute and flirty first-year boy appears and offers to help Mazumi with her love life.

(Source: Dessert, translated)